Subtract 20/35 from 3/12
3/12 - 20/35 is -9/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 35 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 12 × 35 = 420,
3/12 = 3 × 35/12 × 35 = 105/420 - Likewise, for the 2nd fraction, since 35 × 12 = 420,
20/35 = 20 × 12/35 × 12 = 240/420 - Subtract the two like fractions:
105/420 - 240/420 = 105 - 240/420 = -135/420 - After reducing the fraction, the answer is -9/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/12-20/35 3/12-40/35 3/24-20/35 3/12-20/70 9/12-20/35 3/12-60/35 3/36-20/35 15/12-20/35 3/60-20/35 21/12-20/35 3/84-20/35